Error-prone: fill in the area unit.
2. Unit 1 "Location and Direction", relative location: northeast to southwest.
3. Calculation: two digits are divided by one digit, two digits are multiplied by two digits, three digits are multiplied by one digit, and decimal is added and subtracted.
4. Flexible application of dividing three digits by one digit; Oral multiplication of two digits multiplied by integer ten.
5. Decimal reading and writing; After the calculation of time.
6. Check the area of the square. Error-prone: I forgot to bring my unit.
7. collocation. Think in an orderly way, not weighing or leaking.
8. Check the perimeter and area of the rectangle. Tip: Find the appropriate length and width with the help of graphics. It's easy to forget to bring your unit.
Second, 1. Da Yue's knowledge.
2. Location and direction. Reading ability and method of doing the problem, drawing helps to understand the meaning of the problem.
3. Comparison of decimals. But be careful: the faster you run, the shorter it takes.
4. Calculation of the perimeter and area of a long square.
5. The meaning of two digits multiplied by two digits
Three. 1. Festival survey
2. Investigate the relationship between perimeter and area.
3. Investigate the calculation method of dividing two digits by one digit.
4. Examine the judgment method of leap year.
5. Mathematics in Life: Use of Perimeter
4.2. Written calculation: two digits are multiplied by two digits (carry), integer ten is multiplied by two digits, three digits are divided by one digit (with 0 in the middle, two digits in the quotient and zero at the end), and decimal addition.
Verb (abbreviation of verb) 1. Investigate the conversion between decimal and fraction, and determine the unit "1".
Error-prone point: 9 grids were drawn from the drawing, but 10 grids were not framed.
There are two answers to this question: ① Circle 10 squares and draw 9 squares.
② Draw 90 squares on square paper.
2. Keywords: draw rectangles and squares
Requirements: equal area
Error-prone point: equal area
Calculate the length and perimeter of a square, perimeter unit
3. Statistical arrangement of inspection data
Six, 1. Check decimal addition and subtraction
Error-prone point: need to read and extract effective information, decimal calculation.
2. Formulas, ratios and answers
Error-prone point: the calculation of multiplying two digits by two digits.
3. Method 1: First find out how many bottles of drinks are put in each refrigerator.
Then find out how many bottles of drinks are put on each floor on average.
Method 2: First, find out a * * *, how many layers are put, and then find out how many bottles of drinks are put on each layer on average.
4. Method 1: Find out the length and width of the balcony first, and then find out the area of the balcony.
Method 2: first find out how many tiles are laid, then find out the area of tiles, and finally find out the area of balcony.
Error-prone point: unit conversion, the two methods are confused.